mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-27 04:52:05 +08:00
492d29ea1c
This patch splits the TRY_CATCH macro into three, so that we go from
this:
~~~
volatile gdb_exception ex;
TRY_CATCH (ex, RETURN_MASK_ERROR)
{
}
if (ex.reason < 0)
{
}
~~~
to this:
~~~
TRY
{
}
CATCH (ex, RETURN_MASK_ERROR)
{
}
END_CATCH
~~~
Thus, we'll be getting rid of the local volatile exception object, and
declaring the caught exception in the catch block.
This allows reimplementing TRY/CATCH in terms of C++ exceptions when
building in C++ mode, while still allowing to build GDB in C mode
(using setjmp/longjmp), as a transition step.
TBC, after this patch, is it _not_ valid to have code between the TRY
and the CATCH blocks, like:
TRY
{
}
// some code here.
CATCH (ex, RETURN_MASK_ERROR)
{
}
END_CATCH
Just like it isn't valid to do that with C++'s native try/catch.
By switching to creating the exception object inside the CATCH block
scope, we can get rid of all the explicitly allocated volatile
exception objects all over the tree, and map the CATCH block more
directly to C++'s catch blocks.
The majority of the TRY_CATCH -> TRY+CATCH+END_CATCH conversion was
done with a script, rerun from scratch at every rebase, no manual
editing involved. After the mechanical conversion, a few places
needed manual intervention, to fix preexisting cases where we were
using the exception object outside of the TRY_CATCH block, and cases
where we were using "else" after a 'if (ex.reason) < 0)' [a CATCH
after this patch]. The result was folded into this patch so that GDB
still builds at each incremental step.
END_CATCH is necessary for two reasons:
First, because we name the exception object in the CATCH block, which
requires creating a scope, which in turn must be closed somewhere.
Declaring the exception variable in the initializer field of a for
block, like:
#define CATCH(EXCEPTION, mask) \
for (struct gdb_exception EXCEPTION; \
exceptions_state_mc_catch (&EXCEPTION, MASK); \
EXCEPTION = exception_none)
would avoid needing END_CATCH, but alas, in C mode, we build with C90,
which doesn't allow mixed declarations and code.
Second, because when TRY/CATCH are wired to real C++ try/catch, as
long as we need to handle cleanup chains, even if there's no CATCH
block that wants to catch the exception, we need for stop at every
frame in the unwind chain and run cleanups, then rethrow. That will
be done in END_CATCH.
After we require C++, we'll still need TRY/CATCH/END_CATCH until
cleanups are completely phased out -- TRY/CATCH in C++ mode will
save/restore the current cleanup chain, like in C mode, and END_CATCH
catches otherwise uncaugh exceptions, runs cleanups and rethrows, so
that C++ cleanups and exceptions can coexist.
IMO, this still makes the TRY/CATCH code look a bit more like a
newcomer would expect, so IMO worth it even if we weren't considering
C++.
gdb/ChangeLog.
2015-03-07 Pedro Alves <palves@redhat.com>
* common/common-exceptions.c (struct catcher) <exception>: No
longer a pointer to volatile exception. Now an exception value.
<mask>: Delete field.
(exceptions_state_mc_init): Remove all parameters. Adjust.
(exceptions_state_mc): No longer pop the catcher here.
(exceptions_state_mc_catch): New function.
(throw_exception): Adjust.
* common/common-exceptions.h (exceptions_state_mc_init): Remove
all parameters.
(exceptions_state_mc_catch): Declare.
(TRY_CATCH): Rename to ...
(TRY): ... this. Remove EXCEPTION and MASK parameters.
(CATCH, END_CATCH): New.
All callers adjusted.
gdb/gdbserver/ChangeLog:
2015-03-07 Pedro Alves <palves@redhat.com>
Adjust all callers of TRY_CATCH to use TRY/CATCH/END_CATCH
instead.
774 lines
20 KiB
C
774 lines
20 KiB
C
/* Convert symbols from GDB to GCC
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Copyright (C) 2014-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "compile-internal.h"
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#include "gdb_assert.h"
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#include "symtab.h"
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#include "parser-defs.h"
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#include "block.h"
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#include "objfiles.h"
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#include "compile.h"
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#include "value.h"
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#include "exceptions.h"
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#include "gdbtypes.h"
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#include "dwarf2loc.h"
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/* Object of this type are stored in the compiler's symbol_err_map. */
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struct symbol_error
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{
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/* The symbol. */
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const struct symbol *sym;
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/* The error message to emit. This is malloc'd and owned by the
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hash table. */
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char *message;
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};
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/* Hash function for struct symbol_error. */
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static hashval_t
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hash_symbol_error (const void *a)
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{
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const struct symbol_error *se = a;
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return htab_hash_pointer (se->sym);
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}
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/* Equality function for struct symbol_error. */
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static int
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eq_symbol_error (const void *a, const void *b)
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{
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const struct symbol_error *sea = a;
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const struct symbol_error *seb = b;
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return sea->sym == seb->sym;
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}
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/* Deletion function for struct symbol_error. */
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static void
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del_symbol_error (void *a)
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{
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struct symbol_error *se = a;
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xfree (se->message);
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xfree (se);
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}
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/* Associate SYMBOL with some error text. */
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static void
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insert_symbol_error (htab_t hash, const struct symbol *sym, const char *text)
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{
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struct symbol_error e;
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void **slot;
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e.sym = sym;
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slot = htab_find_slot (hash, &e, INSERT);
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if (*slot == NULL)
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{
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struct symbol_error *e = XNEW (struct symbol_error);
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e->sym = sym;
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e->message = xstrdup (text);
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*slot = e;
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}
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}
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/* Emit the error message corresponding to SYM, if one exists, and
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arrange for it not to be emitted again. */
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static void
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error_symbol_once (struct compile_c_instance *context,
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const struct symbol *sym)
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{
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struct symbol_error search;
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struct symbol_error *err;
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char *message;
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if (context->symbol_err_map == NULL)
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return;
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search.sym = sym;
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err = htab_find (context->symbol_err_map, &search);
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if (err == NULL || err->message == NULL)
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return;
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message = err->message;
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err->message = NULL;
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make_cleanup (xfree, message);
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error (_("%s"), message);
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}
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/* Compute the name of the pointer representing a local symbol's
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address. */
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static char *
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symbol_substitution_name (struct symbol *sym)
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{
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return concat ("__", SYMBOL_NATURAL_NAME (sym), "_ptr", (char *) NULL);
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}
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/* Convert a given symbol, SYM, to the compiler's representation.
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CONTEXT is the compiler instance. IS_GLOBAL is true if the
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symbol came from the global scope. IS_LOCAL is true if the symbol
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came from a local scope. (Note that the two are not strictly
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inverses because the symbol might have come from the static
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scope.) */
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static void
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convert_one_symbol (struct compile_c_instance *context,
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struct symbol *sym,
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int is_global,
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int is_local)
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{
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gcc_type sym_type;
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const char *filename = symbol_symtab (sym)->filename;
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unsigned short line = SYMBOL_LINE (sym);
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error_symbol_once (context, sym);
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if (SYMBOL_CLASS (sym) == LOC_LABEL)
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sym_type = 0;
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else
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sym_type = convert_type (context, SYMBOL_TYPE (sym));
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if (SYMBOL_DOMAIN (sym) == STRUCT_DOMAIN)
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{
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/* Binding a tag, so we don't need to build a decl. */
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C_CTX (context)->c_ops->tagbind (C_CTX (context),
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SYMBOL_NATURAL_NAME (sym),
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sym_type, filename, line);
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}
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else
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{
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gcc_decl decl;
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enum gcc_c_symbol_kind kind;
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CORE_ADDR addr = 0;
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char *symbol_name = NULL;
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switch (SYMBOL_CLASS (sym))
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{
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case LOC_TYPEDEF:
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kind = GCC_C_SYMBOL_TYPEDEF;
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break;
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case LOC_LABEL:
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kind = GCC_C_SYMBOL_LABEL;
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addr = SYMBOL_VALUE_ADDRESS (sym);
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break;
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case LOC_BLOCK:
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kind = GCC_C_SYMBOL_FUNCTION;
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addr = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
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if (is_global && TYPE_GNU_IFUNC (SYMBOL_TYPE (sym)))
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addr = gnu_ifunc_resolve_addr (target_gdbarch (), addr);
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break;
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case LOC_CONST:
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if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_ENUM)
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{
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/* Already handled by convert_enum. */
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return;
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}
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C_CTX (context)->c_ops->build_constant (C_CTX (context), sym_type,
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SYMBOL_NATURAL_NAME (sym),
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SYMBOL_VALUE (sym),
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filename, line);
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return;
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case LOC_CONST_BYTES:
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error (_("Unsupported LOC_CONST_BYTES for symbol \"%s\"."),
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SYMBOL_PRINT_NAME (sym));
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case LOC_UNDEF:
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internal_error (__FILE__, __LINE__, _("LOC_UNDEF found for \"%s\"."),
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SYMBOL_PRINT_NAME (sym));
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case LOC_COMMON_BLOCK:
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error (_("Fortran common block is unsupported for compilation "
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"evaluaton of symbol \"%s\"."),
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SYMBOL_PRINT_NAME (sym));
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case LOC_OPTIMIZED_OUT:
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error (_("Symbol \"%s\" cannot be used for compilation evaluation "
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"as it is optimized out."),
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SYMBOL_PRINT_NAME (sym));
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case LOC_COMPUTED:
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if (is_local)
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goto substitution;
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/* Probably TLS here. */
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warning (_("Symbol \"%s\" is thread-local and currently can only "
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"be referenced from the current thread in "
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"compiled code."),
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SYMBOL_PRINT_NAME (sym));
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/* FALLTHROUGH */
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case LOC_UNRESOLVED:
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/* 'symbol_name' cannot be used here as that one is used only for
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local variables from compile_dwarf_expr_to_c.
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Global variables can be accessed by GCC only by their address, not
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by their name. */
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{
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struct value *val;
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struct frame_info *frame = NULL;
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if (symbol_read_needs_frame (sym))
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{
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frame = get_selected_frame (NULL);
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if (frame == NULL)
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error (_("Symbol \"%s\" cannot be used because "
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"there is no selected frame"),
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SYMBOL_PRINT_NAME (sym));
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}
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val = read_var_value (sym, frame);
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if (VALUE_LVAL (val) != lval_memory)
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error (_("Symbol \"%s\" cannot be used for compilation "
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"evaluation as its address has not been found."),
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SYMBOL_PRINT_NAME (sym));
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kind = GCC_C_SYMBOL_VARIABLE;
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addr = value_address (val);
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}
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break;
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case LOC_REGISTER:
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case LOC_ARG:
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case LOC_REF_ARG:
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case LOC_REGPARM_ADDR:
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case LOC_LOCAL:
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substitution:
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kind = GCC_C_SYMBOL_VARIABLE;
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symbol_name = symbol_substitution_name (sym);
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break;
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case LOC_STATIC:
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kind = GCC_C_SYMBOL_VARIABLE;
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addr = SYMBOL_VALUE_ADDRESS (sym);
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break;
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case LOC_FINAL_VALUE:
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default:
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gdb_assert_not_reached ("Unreachable case in convert_one_symbol.");
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}
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/* Don't emit local variable decls for a raw expression. */
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if (context->base.scope != COMPILE_I_RAW_SCOPE
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|| symbol_name == NULL)
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{
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decl = C_CTX (context)->c_ops->build_decl (C_CTX (context),
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SYMBOL_NATURAL_NAME (sym),
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kind,
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sym_type,
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symbol_name, addr,
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filename, line);
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C_CTX (context)->c_ops->bind (C_CTX (context), decl, is_global);
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}
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xfree (symbol_name);
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}
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}
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/* Convert a full symbol to its gcc form. CONTEXT is the compiler to
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use, IDENTIFIER is the name of the symbol, SYM is the symbol
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itself, and DOMAIN is the domain which was searched. */
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static void
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convert_symbol_sym (struct compile_c_instance *context, const char *identifier,
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struct symbol *sym, domain_enum domain)
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{
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const struct block *static_block, *found_block;
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int is_local_symbol;
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found_block = block_found;
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/* If we found a symbol and it is not in the static or global
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scope, then we should first convert any static or global scope
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symbol of the same name. This lets this unusual case work:
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int x; // Global.
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int func(void)
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{
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int x;
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// At this spot, evaluate "extern int x; x"
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}
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*/
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static_block = block_static_block (found_block);
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/* STATIC_BLOCK is NULL if FOUND_BLOCK is the global block. */
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is_local_symbol = (found_block != static_block && static_block != NULL);
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if (is_local_symbol)
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{
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struct symbol *global_sym;
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global_sym = lookup_symbol (identifier, NULL, domain, NULL);
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/* If the outer symbol is in the static block, we ignore it, as
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it cannot be referenced. */
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if (global_sym != NULL
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&& block_found != block_static_block (block_found))
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{
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if (compile_debug)
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fprintf_unfiltered (gdb_stdout,
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"gcc_convert_symbol \"%s\": global symbol\n",
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identifier);
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convert_one_symbol (context, global_sym, 1, 0);
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}
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}
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if (compile_debug)
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fprintf_unfiltered (gdb_stdout,
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"gcc_convert_symbol \"%s\": local symbol\n",
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identifier);
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convert_one_symbol (context, sym, 0, is_local_symbol);
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}
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/* Convert a minimal symbol to its gcc form. CONTEXT is the compiler
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to use and BMSYM is the minimal symbol to convert. */
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static void
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convert_symbol_bmsym (struct compile_c_instance *context,
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struct bound_minimal_symbol bmsym)
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{
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struct minimal_symbol *msym = bmsym.minsym;
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struct objfile *objfile = bmsym.objfile;
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struct type *type;
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enum gcc_c_symbol_kind kind;
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gcc_type sym_type;
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gcc_decl decl;
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CORE_ADDR addr;
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addr = MSYMBOL_VALUE_ADDRESS (objfile, msym);
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/* Conversion copied from write_exp_msymbol. */
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switch (MSYMBOL_TYPE (msym))
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{
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case mst_text:
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case mst_file_text:
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case mst_solib_trampoline:
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type = objfile_type (objfile)->nodebug_text_symbol;
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kind = GCC_C_SYMBOL_FUNCTION;
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break;
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case mst_text_gnu_ifunc:
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/* nodebug_text_gnu_ifunc_symbol would cause:
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function return type cannot be function */
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type = objfile_type (objfile)->nodebug_text_symbol;
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kind = GCC_C_SYMBOL_FUNCTION;
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addr = gnu_ifunc_resolve_addr (target_gdbarch (), addr);
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break;
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case mst_data:
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case mst_file_data:
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case mst_bss:
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case mst_file_bss:
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type = objfile_type (objfile)->nodebug_data_symbol;
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kind = GCC_C_SYMBOL_VARIABLE;
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break;
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case mst_slot_got_plt:
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type = objfile_type (objfile)->nodebug_got_plt_symbol;
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kind = GCC_C_SYMBOL_FUNCTION;
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break;
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default:
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type = objfile_type (objfile)->nodebug_unknown_symbol;
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kind = GCC_C_SYMBOL_VARIABLE;
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break;
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}
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sym_type = convert_type (context, type);
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decl = C_CTX (context)->c_ops->build_decl (C_CTX (context),
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MSYMBOL_NATURAL_NAME (msym),
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kind, sym_type, NULL, addr,
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NULL, 0);
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C_CTX (context)->c_ops->bind (C_CTX (context), decl, 1 /* is_global */);
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}
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/* See compile-internal.h. */
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void
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gcc_convert_symbol (void *datum,
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struct gcc_c_context *gcc_context,
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enum gcc_c_oracle_request request,
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const char *identifier)
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{
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struct compile_c_instance *context = datum;
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domain_enum domain;
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int found = 0;
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switch (request)
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{
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case GCC_C_ORACLE_SYMBOL:
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domain = VAR_DOMAIN;
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break;
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case GCC_C_ORACLE_TAG:
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domain = STRUCT_DOMAIN;
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break;
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case GCC_C_ORACLE_LABEL:
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domain = LABEL_DOMAIN;
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break;
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default:
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gdb_assert_not_reached ("Unrecognized oracle request.");
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}
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/* We can't allow exceptions to escape out of this callback. Safest
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is to simply emit a gcc error. */
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TRY
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{
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struct symbol *sym;
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sym = lookup_symbol (identifier, context->base.block, domain, NULL);
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if (sym != NULL)
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{
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convert_symbol_sym (context, identifier, sym, domain);
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found = 1;
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}
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else if (domain == VAR_DOMAIN)
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{
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struct bound_minimal_symbol bmsym;
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|
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bmsym = lookup_minimal_symbol (identifier, NULL, NULL);
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if (bmsym.minsym != NULL)
|
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{
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convert_symbol_bmsym (context, bmsym);
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found = 1;
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}
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}
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}
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|
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CATCH (e, RETURN_MASK_ALL)
|
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{
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C_CTX (context)->c_ops->error (C_CTX (context), e.message);
|
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}
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END_CATCH
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|
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if (compile_debug && !found)
|
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fprintf_unfiltered (gdb_stdout,
|
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"gcc_convert_symbol \"%s\": lookup_symbol failed\n",
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identifier);
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return;
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}
|
||
|
||
/* See compile-internal.h. */
|
||
|
||
gcc_address
|
||
gcc_symbol_address (void *datum, struct gcc_c_context *gcc_context,
|
||
const char *identifier)
|
||
{
|
||
struct compile_c_instance *context = datum;
|
||
gcc_address result = 0;
|
||
int found = 0;
|
||
|
||
/* We can't allow exceptions to escape out of this callback. Safest
|
||
is to simply emit a gcc error. */
|
||
TRY
|
||
{
|
||
struct symbol *sym;
|
||
|
||
/* We only need global functions here. */
|
||
sym = lookup_symbol (identifier, NULL, VAR_DOMAIN, NULL);
|
||
if (sym != NULL && SYMBOL_CLASS (sym) == LOC_BLOCK)
|
||
{
|
||
if (compile_debug)
|
||
fprintf_unfiltered (gdb_stdout,
|
||
"gcc_symbol_address \"%s\": full symbol\n",
|
||
identifier);
|
||
result = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
|
||
if (TYPE_GNU_IFUNC (SYMBOL_TYPE (sym)))
|
||
result = gnu_ifunc_resolve_addr (target_gdbarch (), result);
|
||
found = 1;
|
||
}
|
||
else
|
||
{
|
||
struct bound_minimal_symbol msym;
|
||
|
||
msym = lookup_bound_minimal_symbol (identifier);
|
||
if (msym.minsym != NULL)
|
||
{
|
||
if (compile_debug)
|
||
fprintf_unfiltered (gdb_stdout,
|
||
"gcc_symbol_address \"%s\": minimal "
|
||
"symbol\n",
|
||
identifier);
|
||
result = BMSYMBOL_VALUE_ADDRESS (msym);
|
||
if (MSYMBOL_TYPE (msym.minsym) == mst_text_gnu_ifunc)
|
||
result = gnu_ifunc_resolve_addr (target_gdbarch (), result);
|
||
found = 1;
|
||
}
|
||
}
|
||
}
|
||
|
||
CATCH (e, RETURN_MASK_ERROR)
|
||
{
|
||
C_CTX (context)->c_ops->error (C_CTX (context), e.message);
|
||
}
|
||
END_CATCH
|
||
|
||
if (compile_debug && !found)
|
||
fprintf_unfiltered (gdb_stdout,
|
||
"gcc_symbol_address \"%s\": failed\n",
|
||
identifier);
|
||
return result;
|
||
}
|
||
|
||
|
||
|
||
/* A hash function for symbol names. */
|
||
|
||
static hashval_t
|
||
hash_symname (const void *a)
|
||
{
|
||
const struct symbol *sym = a;
|
||
|
||
return htab_hash_string (SYMBOL_NATURAL_NAME (sym));
|
||
}
|
||
|
||
/* A comparison function for hash tables that just looks at symbol
|
||
names. */
|
||
|
||
static int
|
||
eq_symname (const void *a, const void *b)
|
||
{
|
||
const struct symbol *syma = a;
|
||
const struct symbol *symb = b;
|
||
|
||
return strcmp (SYMBOL_NATURAL_NAME (syma), SYMBOL_NATURAL_NAME (symb)) == 0;
|
||
}
|
||
|
||
/* If a symbol with the same name as SYM is already in HASHTAB, return
|
||
1. Otherwise, add SYM to HASHTAB and return 0. */
|
||
|
||
static int
|
||
symbol_seen (htab_t hashtab, struct symbol *sym)
|
||
{
|
||
void **slot;
|
||
|
||
slot = htab_find_slot (hashtab, sym, INSERT);
|
||
if (*slot != NULL)
|
||
return 1;
|
||
|
||
*slot = sym;
|
||
return 0;
|
||
}
|
||
|
||
/* Generate C code to compute the length of a VLA. */
|
||
|
||
static void
|
||
generate_vla_size (struct compile_c_instance *compiler,
|
||
struct ui_file *stream,
|
||
struct gdbarch *gdbarch,
|
||
unsigned char *registers_used,
|
||
CORE_ADDR pc,
|
||
struct type *type,
|
||
struct symbol *sym)
|
||
{
|
||
type = check_typedef (type);
|
||
|
||
if (TYPE_CODE (type) == TYPE_CODE_REF)
|
||
type = check_typedef (TYPE_TARGET_TYPE (type));
|
||
|
||
switch (TYPE_CODE (type))
|
||
{
|
||
case TYPE_CODE_RANGE:
|
||
{
|
||
if (TYPE_HIGH_BOUND_KIND (type) == PROP_LOCEXPR
|
||
|| TYPE_HIGH_BOUND_KIND (type) == PROP_LOCLIST)
|
||
{
|
||
const struct dynamic_prop *prop = &TYPE_RANGE_DATA (type)->high;
|
||
char *name = c_get_range_decl_name (prop);
|
||
struct cleanup *cleanup = make_cleanup (xfree, name);
|
||
|
||
dwarf2_compile_property_to_c (stream, name,
|
||
gdbarch, registers_used,
|
||
prop, pc, sym);
|
||
do_cleanups (cleanup);
|
||
}
|
||
}
|
||
break;
|
||
|
||
case TYPE_CODE_ARRAY:
|
||
generate_vla_size (compiler, stream, gdbarch, registers_used, pc,
|
||
TYPE_INDEX_TYPE (type), sym);
|
||
generate_vla_size (compiler, stream, gdbarch, registers_used, pc,
|
||
TYPE_TARGET_TYPE (type), sym);
|
||
break;
|
||
|
||
case TYPE_CODE_UNION:
|
||
case TYPE_CODE_STRUCT:
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < TYPE_NFIELDS (type); ++i)
|
||
if (!field_is_static (&TYPE_FIELD (type, i)))
|
||
generate_vla_size (compiler, stream, gdbarch, registers_used, pc,
|
||
TYPE_FIELD_TYPE (type, i), sym);
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Generate C code to compute the address of SYM. */
|
||
|
||
static void
|
||
generate_c_for_for_one_variable (struct compile_c_instance *compiler,
|
||
struct ui_file *stream,
|
||
struct gdbarch *gdbarch,
|
||
unsigned char *registers_used,
|
||
CORE_ADDR pc,
|
||
struct symbol *sym)
|
||
{
|
||
|
||
TRY
|
||
{
|
||
if (is_dynamic_type (SYMBOL_TYPE (sym)))
|
||
{
|
||
struct ui_file *size_file = mem_fileopen ();
|
||
struct cleanup *cleanup = make_cleanup_ui_file_delete (size_file);
|
||
|
||
generate_vla_size (compiler, size_file, gdbarch, registers_used, pc,
|
||
SYMBOL_TYPE (sym), sym);
|
||
ui_file_put (size_file, ui_file_write_for_put, stream);
|
||
|
||
do_cleanups (cleanup);
|
||
}
|
||
|
||
if (SYMBOL_COMPUTED_OPS (sym) != NULL)
|
||
{
|
||
char *generated_name = symbol_substitution_name (sym);
|
||
struct cleanup *cleanup = make_cleanup (xfree, generated_name);
|
||
/* We need to emit to a temporary buffer in case an error
|
||
occurs in the middle. */
|
||
struct ui_file *local_file = mem_fileopen ();
|
||
|
||
make_cleanup_ui_file_delete (local_file);
|
||
SYMBOL_COMPUTED_OPS (sym)->generate_c_location (sym, local_file,
|
||
gdbarch,
|
||
registers_used,
|
||
pc, generated_name);
|
||
ui_file_put (local_file, ui_file_write_for_put, stream);
|
||
|
||
do_cleanups (cleanup);
|
||
}
|
||
else
|
||
{
|
||
switch (SYMBOL_CLASS (sym))
|
||
{
|
||
case LOC_REGISTER:
|
||
case LOC_ARG:
|
||
case LOC_REF_ARG:
|
||
case LOC_REGPARM_ADDR:
|
||
case LOC_LOCAL:
|
||
error (_("Local symbol unhandled when generating C code."));
|
||
|
||
case LOC_COMPUTED:
|
||
gdb_assert_not_reached (_("LOC_COMPUTED variable "
|
||
"missing a method."));
|
||
|
||
default:
|
||
/* Nothing to do for all other cases, as they don't represent
|
||
local variables. */
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
CATCH (e, RETURN_MASK_ERROR)
|
||
{
|
||
if (compiler->symbol_err_map == NULL)
|
||
compiler->symbol_err_map = htab_create_alloc (10,
|
||
hash_symbol_error,
|
||
eq_symbol_error,
|
||
del_symbol_error,
|
||
xcalloc,
|
||
xfree);
|
||
insert_symbol_error (compiler->symbol_err_map, sym, e.message);
|
||
}
|
||
END_CATCH
|
||
}
|
||
|
||
/* See compile-internal.h. */
|
||
|
||
unsigned char *
|
||
generate_c_for_variable_locations (struct compile_c_instance *compiler,
|
||
struct ui_file *stream,
|
||
struct gdbarch *gdbarch,
|
||
const struct block *block,
|
||
CORE_ADDR pc)
|
||
{
|
||
struct cleanup *cleanup, *outer;
|
||
htab_t symhash;
|
||
const struct block *static_block = block_static_block (block);
|
||
unsigned char *registers_used;
|
||
|
||
/* If we're already in the static or global block, there is nothing
|
||
to write. */
|
||
if (static_block == NULL || block == static_block)
|
||
return NULL;
|
||
|
||
registers_used = XCNEWVEC (unsigned char, gdbarch_num_regs (gdbarch));
|
||
outer = make_cleanup (xfree, registers_used);
|
||
|
||
/* Ensure that a given name is only entered once. This reflects the
|
||
reality of shadowing. */
|
||
symhash = htab_create_alloc (1, hash_symname, eq_symname, NULL,
|
||
xcalloc, xfree);
|
||
cleanup = make_cleanup_htab_delete (symhash);
|
||
|
||
while (1)
|
||
{
|
||
struct symbol *sym;
|
||
struct block_iterator iter;
|
||
|
||
/* Iterate over symbols in this block, generating code to
|
||
compute the location of each local variable. */
|
||
for (sym = block_iterator_first (block, &iter);
|
||
sym != NULL;
|
||
sym = block_iterator_next (&iter))
|
||
{
|
||
if (!symbol_seen (symhash, sym))
|
||
generate_c_for_for_one_variable (compiler, stream, gdbarch,
|
||
registers_used, pc, sym);
|
||
}
|
||
|
||
/* If we just finished the outermost block of a function, we're
|
||
done. */
|
||
if (BLOCK_FUNCTION (block) != NULL)
|
||
break;
|
||
block = BLOCK_SUPERBLOCK (block);
|
||
}
|
||
|
||
do_cleanups (cleanup);
|
||
discard_cleanups (outer);
|
||
return registers_used;
|
||
}
|